超小的羧甲基壳聚糖超顺磁氧化铁纳米粒制备及处方优化
Chinese Journal of Modern Applied Pharmacy(2010)
Abstract
目的优化羧甲壳聚糖超小超顺磁氧化铁纳米粒(O-carboxymethyl-chitosan ultra-small superparamagnetic iron oxide nanoparticle,OCMCS-USPIO-NPs)处方并对其理化性质进行表征。方法共沉淀法合成超顺磁氧化铁纳米粒核并用羧甲基壳聚糖对其表面进行共价修饰,用正交实验L9(34)对OCMCS-USPIO-NPs的处方优化和工艺进行优化筛选;用透射电镜、电子相关光谱仪(LSD)、X-Ray衍射法、傅立叶红外、磁性测定仪、MRI扫描仪和邻二氮菲法测定铁含量等对制备的OCMCS-USPIO-NPs进行表征;用普鲁士蓝染色法体外评价OCMCS-USPIO-NPs抗吞噬能力。结果正交实验处方优化处方为:羧甲基壳聚糖的分子量为1~2万,浓度为3%,超声时间为45 min,功率为600 W;傅立叶红外和X-Rays结果证实了OCMCS-SPIO-NPs的合成,羧甲基壳聚糖的修饰显著降低超顺磁氧化铁的流体粒径及超顺磁性,修饰后饱和磁性为73.4 emu.g-1 Fe,磁性较强;同时增加纳米粒表面的Zeta电位,普鲁士蓝染色结果表明巨噬细胞吞噬的纳米粒量依次是:uncoated SPIO-NPs>dextran-SPIO-NPs>OCMCS-SPIO-NPs。结论合成的OCMCS-USPIO-NPs的流体粒径<50 nm,具有强的超顺磁性,分散性好,能逃避巨噬细胞的摄取,可用于MRI照影。
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Key words
orthogonal experimental design,MRI contrast agent,O-carboxymethyl-chitosan,ultra-small superparamagnetic iron oxide nanoparticle
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